With all due respect to Nick, He was given a plenty of runway to make an impression and failed to do so. I still have faith in him overall, but I do as well wonder where his headspace is at. It would be incredibly challenging to be consistently on the sidelines year over year. I do think Nick is a kid that has the right mindset though. He's so determined to prove himself, so I really wouldn't put anything past him.
Without knowing for certain, I'd imagine at some point in his recovery he will be able to at the very least work out other parts of his body given the fact that this most recent injury is his shoulder. I'd imagine he can still work on his core and leg strength as well as conditioning. So hopefully he can come into main camp with a head of steam. I'd also not be opposed to sending him to another rookie camp, even though I know optically that would not look good for him and may piss him off. At the end of the day, we need him to be in game shape by main camp.
It's hard to ask a kid who works as hard as he does to do even more, but at the end of the day that is the price you have to pay if you want to make the NHL.